Automatic attachment to gas-buhners



' A. 'R'."MARSHALL Gas- Regulator.

Patented Aug. 26, 1856.

N. PETERS. Plmlo-Limugrapher, wnningme. D. C.

UNITED STATES PATENT oFFIcE.

A.` R. MARSHALL, OFYSTRATFORD, CONNECTICUT.

AUTOMATIC ATTACHMENT T0 GAS-BURNERS.

Specicationof Letters Patent No. 15,614, dated August 26, 1856.

To all whom rtimay concern:

Be it known that I, AUGUSTUS R. MAR- SHALL, of Stratford, in the county of Fairiield and State of Connecticut, have invented a new and useful Automatic Attachment to Gas-Burners for the Purpose of Shutting Off the Gas when the Light is Extinguished by Accident or Otherwise; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which,-

Figure 1, "is a vertical sectional view, showing the application of myinvention to a gas burner. Fig. 2, is a top view of the same with the cover of the box which incloses the principal mechanism of the at` tachnient, removed to show the interior. Fig. 3, is a view of the bottom of the cover of the box. Figs.` 4 and 5, are detail views which are hereinafter explained.

Similar letters of reference indicate corresponding parts inL the several figures.

A, is a burner of well-known construction and B, is the pipe by which `it is supplied with gas, said pipe leading into a valve box C, containing a puppet valve I), which is fitted to a seat at the bottom of the burner and which has a spring a, coiled round'its stem for the purpose of forcing it up to its seat to shut off the gas from the burner. E, is a handle at the bottom of the valve stem to pull down the valve to open or let the gas into the burner. F, is an arm attached firmly to the valve stem, and connected by a rod b, with the mechanism inthe box Gr, which surrounds the bottom of the burner, said mechanism being for the purpose of locking the valve when open, while the gas is burning, but operating to close the valve when the. light is blown out or accidentally extinguished. The upper part of the rod Z), which enters the box G, has a notch c, which receives an oblique tongue d, on the end of the shorter arm of a horizontal bent lever A, which works on a pivot or fulcrum pin e, within the box. This tongue is shown in Figs. l and 2, and also in Fig. 3, which is an end view of the lever, and is operated upon by the elevation or depression of the rod b, to move the lever on its fulcrum.V

it `is locked by the point of its longer arm being confined in a notch f, see Fig. 2, near the fulcrum of a lighter lever L,'which works on a fulcrum z', within the box G, and when the lever is thus locked, the valve cannot close, for the reason that the rod b, is not allowed to move upward, but when it is unlocked, the valve `is shut `by the spring a. The lever 7L, is operated upon to lock and unlock the lever H, by the following means.

j, is a catch, working on a pivot ina small .stand 7c, which is secured to the bottom of extremity of the long arm of the lever L,

when the said lever is thrown into theposition shown in black in Fig. 2, by the action of the lever, H, in its notch 7, the said catch thus serving to lock the lever H, and hold the valve open. This catch, however, is only intended to serve to'lock the lever It, temporarily, when the gas is first lighted, and a second catch fn., is afterward employed to lock the said. lever, the latter catch being kept in position to lock the lever by the expansion of air produced by the heat of the iame from the burner in a closed chamber I, with which the burner is surrounded. The closed air chamber I, stands immediately on the top of and is attached to the top plate or cover G, of the box Gr, and communicates through a hole in the said cover with a very thin and flexible metal disk or plate p, which is attached, at its edges, in an air-tight manner to the interior of the plate Gr. This disk p, is distended by the expansion of the air in the chamber I, by the heat from the flame, and this distention maybe regulated by a screw g, working through the plate Gr, to regulate the quantity of air in the chamber I. The flexible disk p, constituted a thermostat.

The catch n, consists of a pin secured to a small bar n', which stands below the disk p, where it is hinged at one end to a stand a2, within the box Gr, and supported, at the other end, by a spring r, resting on the bottom of the box in such a manner that before the gas is lighted and the disk p distended` bar n', and causes the pin n, to press down the catch j, as shown in red outline in Fig. l, and to do the duty up to that time performed by the said catch, viz, that of stopping and locking the lever L, whose tendency, owing to the action of the spring a, on the lever H, is to ily toward the position in which it is shown in blue outline in Fig. 2. The catch n, continues in operation till the light is blown out or otherwise eXt-inguished, when, by the cooling of the air in the chamber I, and its consequent contraction, the disk p, is caused to rise and thus allow the catch n, to rise clear of the lever it, and liberate it, thus liberating the lever H, and leaving the rod free to move upward, and by that means allowing the valve to be closed by the spring a. The position of the levers H and 7L, when liberated, is shown in Fig. 2, in blue outline, the lever H, still maintaining its connection with the valve by means of the tongue d, and the notch c, in the rod Z), and the lever h, resting against a spring s. When the valve is opened again by pulling down the handle E, the locking mechanism always sets itself, the lever H, setting the lever L, and the latter lever being first locked by the catch y', and afterward by the catch n.

It must be observed in the arrangement of the catches j, and n, that the catch n,

must stand so far from the notch in the catch j, that the lever it, will pass just over the edge of the notch of the catch j, before being caught by n, in order that when the catch n, rises to allow the lever h, to escape, the said lever may not be again caught by j; this arrangement will be readily understood by reference to Fig. 5.

This automatic shut-off apparatus may be used either with or without a cock of the usual kind, to turn the gas on or olf the burner.

What I claim as my invent-ion and desire to secure by Letters Patent, is-

l. The combination with the thermostat p, and the valve D, ofthe catch u on the bar nl, and the system of levers h, H, for the locking and unlocking of the valve, in the manner and for the purposes specified.

2. Combining with the locking'catch n, or its equivalent, which is acted upon by the thermostat p, another catch j, so arranged as to lock the valve open until the catch n, is set in operation by the action of the thermostat and then to be moved out of the way by the catch a, substantially as herein described.

A. R1 MARSHALL. Witnesses:

CHAs. B. GoULDiNG, JOHN GOULDING. 

